Free browser tool

Preview an OpenAPI YAML or JSON file in your browser.

See the endpoints, server URLs, security schemes, external references, and obvious sharing risks before you send the spec to anyone. The file never leaves this browser.

Local file processing OpenAPI 3.x and Swagger 2.0 Endpoint and sharing-readiness review

01 / Open a spec

Inspect YAML or JSON locally.

The parser runs in this browser. Your API paths, schemas, and descriptions are not uploaded to internalpage.

Choose an OpenAPI file.yaml, .yml, or .json, up to 10 MB

This preview checks document shape, not API behavior or schema correctness. Do not publish credentials inside a spec.

02 / Review the API

No spec opened yet

The API title, endpoints, security schemes, and external references will appear here.